

package com.hazelcast.map.impl.operation.steps;

import com.hazelcast.internal.serialization.SerializationService;
import com.hazelcast.internal.util.comparators.ValueComparator;
import com.hazelcast.map.impl.MapContainer;
import com.hazelcast.map.impl.MapServiceContext;
import com.hazelcast.map.impl.mapstore.MapDataStore;
import com.hazelcast.map.impl.operation.steps.engine.State;
import com.hazelcast.map.impl.operation.steps.engine.Step;
import com.hazelcast.map.impl.recordstore.DefaultRecordStore;

public enum RemoveIfSameOpSteps implements IMapOpStep {

    READ() {
        @Override
        public void runStep(State state) {
            RemoveOpSteps.READ.runStep(state);
        }

        @Override
        public RemoveIfSameOpSteps nextStep(State state) {
            return state.isRecordExistsInMemory() ? RemoveIfSameOpSteps.ON_LOAD : RemoveIfSameOpSteps.LOAD;
        }
    },

    LOAD() {
        @Override
        public boolean isLoadStep() {
            return true;
        }

        @Override
        public void runStep(State state) {
            DefaultRecordStore recordStore = (DefaultRecordStore) state.getRecordStore();
            Object oldValue = recordStore.loadValueOfKey(state.getKey(), state.getNow());
            if (oldValue != null) {
                recordStore.getMapDataStore().remove(state.getKey(), state.getNow(), state.getTxnId());
                state.setOldValue(oldValue);
            } else {
                state.setResult(false);
            }
        }

        @Override
        public Step nextStep(State state) {
            return state.getOldValue() == null ? UtilSteps.FINAL_STEP : RemoveIfSameOpSteps.ON_LOAD;
        }
    },

    ON_LOAD() {
        @Override
        public void runStep(State state) {
            DefaultRecordStore recordStore = (DefaultRecordStore) state.getRecordStore();
            MapContainer mapContainer = recordStore.getMapContainer();
            MapServiceContext mapServiceContext = mapContainer.getMapServiceContext();
            SerializationService serializationService = mapServiceContext.getNodeEngine().getSerializationService();
            ValueComparator valueComparator = recordStore.getValueComparator();

            Object oldValue = state.getOldValue();
            if (valueComparator.isEqual(state.getExpect(), oldValue, serializationService)) {
                mapServiceContext.interceptRemove(mapContainer.getInterceptorRegistry(), oldValue);
            } else {
                state.setResult(false);
                state.setStopExecution(true);
            }
        }

        @Override
        public Step nextStep(State state) {
            return state.isStopExecution() ? UtilSteps.FINAL_STEP : RemoveIfSameOpSteps.DELETE;
        }
    },

    DELETE() {
        @Override
        public boolean isStoreStep() {
            return true;
        }

        @Override
        public void runStep(State state) {
            MapDataStore mapDataStore = state.getRecordStore().getMapDataStore();
            mapDataStore.remove(state.getKey(), state.getNow(), state.getTxnId());
        }

        @Override
        public RemoveIfSameOpSteps nextStep(State state) {
            return RemoveIfSameOpSteps.ON_DELETE;
        }
    },

    ON_DELETE() {
        @Override
        public void runStep(State state) {
            if (state.isRecordExistsInMemory()) {
                DefaultRecordStore recordStore = (DefaultRecordStore) state.getRecordStore();
                recordStore.onStore(recordStore.getRecord(state.getKey()));
                recordStore.removeByKey(state.getKey(), false);
                recordStore.updateStatsOnRemove(state.getNow());
            }

            state.setResult(true);
        }

        @Override
        public Step nextStep(State state) {
            return UtilSteps.FINAL_STEP;
        }
    };

    RemoveIfSameOpSteps() {
    }
}
